Learn me flex fuel sensors!

So I'm planning to piece together an inexpensive flex fuel setup for my K24 swap FRS. I know GM Continental sensors are well loved but having a hard time seeing out of the dozen part numbers if there is a specific one for my desired application. I know some measure fuel temp as well, so that also then begs the question..... Do I need one that measures temp? What makes one part number different than the other? I mean most of what I see appear to have the same pigtail.

Part numbers in question: 13577429 , 13507128 , 13507129 , 13577394 and I'm certain there's a dozen others out there. I've purchased a plug and play kit for my FRS when running the stock ECU but maybe it's time I got learnt and did it myself?

Also, I'll be running a Haltech Elite 1500. I know I can buy the sensor direct from Haltech with connector and pins for just a hair under $200 but pretty sure I can get considerably under that number going piece meal.

Ooooh, I'm in for this too. The megasquirt documentation has a page on them that I recently read and found quite informative, but I felt the part numbers listed there might be a bit out of date.

I believe the majority of different numbers relate to the fuel line shape and configuration.  It is my understanding that they are almost all the identical sensor.  The one I retrofitted to the V was supposedly a plug and play but really wasn't.  Not terrible but ended up monkeying around with wiring etc.  I would check with your buddies at the parts store as my Advance could have gotten the basic sensor for 70 and I still would have had to buy a few things vs 200 and it still wasn't plug and play.

The one that's sold by Ballenger Motorsports is the one you need.

AFAIK they all measure temperature and they all read the same. 13577429 was the cheapest one when I was looking a couple years ago, and seemed to be the one that most people  were using at that time. I retrofitted one on my Corvette and it works great.

The only real issue with them is that the push-to-connect barbs are so short that with most fittings, once it's on there, there isn't enough room to get a disconnect tool in there to remove it. So, plan accordingly.

In reply to Paul_VR6 (Forum Supporter) :

That's a well priced kit for sure and when it's time to buy probably where I'll get it. I found just the sensor at Rock Auto for $70 before shipping and 5%. Then of course will need a pig tail. Making a mount should be easy.

One thing that still eludes me is the fuel temp. Is that necessary? Pretty sure the kit that was on my previous FRS didn't have that ability, so what would be the benefit? Cold starts? I'm struggling to google it and explain why you need it or don't. If it's only $20-30 that separates the two obviously I'll gravitate towards the more features basket. BUT if it's just another data point that doesn't really effect performance I'll spend that cash on the injector upgrade instead.

obsolete said:

AFAIK they all measure temperature and they all read the same. 13577429 was the cheapest one when I was looking a couple years ago, and seemed to be the one that most people  were using at that time. I retrofitted one on my Corvette and it works great.

The only real issue with them is that the push-to-connect barbs are so short that with most fittings, once it's on there, there isn't enough room to get a disconnect tool in there to remove it. So, plan accordingly.

Interesting. I just found a list of these on TurboMiata forum and it mirrors what you say about them just being packaged differently.

There's this 13507128 for only $38.35 on Prime so probably just pull the trigger on that and figure out the rest.

Fuel temp can be a realnissue with alcohol based fuels. Basic density issues that can be overcome with increased flow at high temps.

We had methanol fuel getting close to boiling in the IRL cars until we added insulating materalials between the engine and fuel cell bulkhead.

This is just me, but I'd likely buy the setup from Haltech since that's the ECU you are going to use. 

It's more expensive, but you'll likely get actual support if you have an issue. Is $100 for support really that big of a deal when you're dropping the kind of coin to do a K24 swap on a newer car? 

In reply to z31maniac :

I can certainly see that side of it. As much as this is an exorcise in budget it's also a good way to learn.

Fuel temp is super handy for high ethanol content cold starts.